Postpartum Depression vs. Bipolar Disorder: Understanding the Differences

Postpartum depression (PPD) and bipolar disorder (BD) are distinct but overlapping:

Critical Link

Women with PPD have ↑ risk of underlying BD (misdiagnosed). Screen for lifetime mania/hypomania (MDQ). Antidepressants alone can trigger mania in BD. Mood stabilizers (lithium, lamotrigine) preferred if BD confirmed. Perinatal psychiatry consultation essential.

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Feature	PPD	Bipolar Disorder
Onset	Within 4 weeks–12 months postpartum	Any time; postpartum high-risk for first episode
Core Symptoms	Depressed mood, anhedonia, anxiety, guilt, insomnia	Episodic mania/hypomania + depression
Mania	Absent	Required (elevated mood, ↑ energy, ↓ sleep, grandiosity)
Psychosis	Rare (postpartum psychosis distinct)	Common in mania/depression
Course	Episodic (often single)	Chronic, recurrent